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2014-10-01T18:29:36+05:30

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Sum of roots  = α+β = 2b/a
Product of roots = αβ = c/a

α³β³ + α²β³ + α³β²
= (αβ)³ + (αβ)²(α+β)
= (c/a)³ + (c/a)² (2b/a)
= (c/a)²[ (c/a) + (2b/a) ] 
= (c/a)²[ (c+2b)/a]
 \frac{c^2(c+2b)}{a^3}

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